Embryo growth rate in vitro as an indicator of embryo quality in IVF cycles.

Purpose: The role of embryo growth rate in vitro as an isolated indicator of embryo quality in IVF was evaluated retrospectively.

Methods: Comparison was made between 98 cycles (group 1), in which only embryos at a cleavage stage of two to three blastomers were transferred, and 99 cycles (group 2), in which all embryos were transferred at a cleavage stage of four or more blastomers. Embryos were transferred at a fixed interval of 42 to 44 h following oocyte insemination.